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StateInfo is usually allocated on the stack by search()

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And passed in do_move(), this ensures maximum efficiency and
speed and at the same time unlimited move numbers.

The draw back is that to handle Position init we need to
reserve a StateInfo inside Position itself and use at
init time and when copying from another Position.

After lazy SMP we don't need anymore this gimmick and we can
get rid of this special case and always pass an external
StateInfo to Position object.

Also rewritten and simplified Position constructors.

Verified it does not regress with a 3 threads SMP test:
ELO: -0.00 +-12.7 (95%) LOS: 50.0%
Total: 1000 W: 173 L: 173 D: 654

No functional change.
This commit is contained in:
Marco Costalba
2016-04-11 16:45:36 +02:00
parent ee7a68ea5f
commit 7eaea3848c
12 changed files with 70 additions and 94 deletions
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36
src/thread.cpp
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@@ -26,8 +26,6 @@
#include "thread.h"
#include "uci.h"
using namespace Search;
ThreadPool Threads; // Global object
/// Thread constructor launches the thread and then waits until it goes to sleep
@@ -171,26 +169,34 @@ int64_t ThreadPool::nodes_searched() {
/// ThreadPool::start_thinking() wakes up the main thread sleeping in idle_loop()
/// and starts a new search, then returns immediately.
void ThreadPool::start_thinking(const Position& pos, const LimitsType& limits,
StateStackPtr& states) {
void ThreadPool::start_thinking(const Position& pos, StateListPtr& states,
const Search::LimitsType& limits) {
main()->wait_for_search_finished();
Signals.stopOnPonderhit = Signals.stop = false;
main()->rootMoves.clear();
main()->rootPos = pos;
Limits = limits;
if (states.get()) // If we don't set a new position, preserve current state
{
SetupStates = std::move(states); // Ownership transfer here
assert(!states.get());
}
Search::Signals.stopOnPonderhit = Search::Signals.stop = false;
Search::Limits = limits;
Search::RootMoves rootMoves;
for (const auto& m : MoveList<LEGAL>(pos))
if ( limits.searchmoves.empty()
|| std::count(limits.searchmoves.begin(), limits.searchmoves.end(), m))
main()->rootMoves.push_back(RootMove(m));
rootMoves.push_back(Search::RootMove(m));
// After ownership transfer 'states' becomes empty, so if we stop the search
// and call 'go' again without setting a new position states.get() == NULL.
assert(states.get() || setupStates.get());
if (states.get())
setupStates = std::move(states); // Ownership transfer, states is now empty
for (Thread* th : Threads)
{
th->maxPly = 0;
th->rootDepth = DEPTH_ZERO;
th->rootMoves = rootMoves;
th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);
}
main()->start_searching();
}